Forces - PHYSICS

Question 1

What is displacement?

Answer 1

The overall distance travelled in a certain direction

Question 2

What are vectors

Answer 2

Special quantities in science that both have a size and a direction

Question 3

What is a scalar?

Answer 3

Something that has a size/magnitude but bi direction

Question 4

What is acceleration?

Answer 4

A change in an objects velocity

Question 5

When the gravitational field is stronger, is the weight larger or smaller?

Answer 5

Larger

Question 6

What equation connects weight, mass and gravitational field strength?

Answer 6

Weight = mass X gravitational field strength

Question 7

Contact forces can only exist when…

Answer 7

The objects are touching

Question 8

Contact or non-contact? Thrust

Answer 8

Contact

Question 9

Contact or non-contact? Gravitational/weight

Answer 9

Non-contact

Question 10

Contact or non-contact? Friction

Answer 10

Contact

Question 11

Contact or non-contact? Air resistance

Answer 11

Contact

Question 12

Contact or non-contact? Tension

Answer 12

Contact

Question 13

Contact or non-contact? Elasticity

Answer 13

Contact

Question 14

Contact or non-contact? Electrostatics

Answer 14

Non-contact

Question 15

Contact or non-contact? Magnetism

Answer 15

Non-contact

Question 16

Contact or non-contact? Upthrust

Answer 16

Contact

Question 17

Contact or non-contact? Lift

Answer 17

Contact

Question 18

Contact or non-contact? Water resistance

Answer 18

Contact

Question 19

What is Newton’s third law?

Answer 19

Every action has an equal and opposite reaction

Question 20

What is Newton’s first law of motion?

Answer 20

If the resultant forces are zero
-the forces are balanced
-If the object is already moving it will continue to do so at a constant speed
-if not it will remain stationary

Question 21

What is the objects centre of mass?

Answer 21

The point at which the weight of an object appears to act from

Question 22

For unsymmetrical objects how do you work out the centre of mass?

Answer 22

You hang them from different points along a plumb line and draw these lines of the object and where they cross over is the centre

Question 23

Where is the centre of mass for a symmetrical object?

Answer 23

Where the lines of symmetry cross

Question 24

What is Newton’s second law?

Answer 24

Force is directly proportional to acceleration.

Question 25

What equation links force, mass and acceleration?

Answer 25

Force = mass X acceleration

Question 26

What is the equation for acceleration?

Answer 26

Final velocity- initial velocity/ time taken

Question 27

What does precise data give you?

Answer 27

Results which are similar to each other if you repeat the measurements

Question 28

What does accurate data give you?

Answer 28

Data which is close to the true value

Question 29

What are random errors?

Answer 29

Errors made by the person carrying out the measuring and are normally down to timing incorrectly. Affect precision

Question 30

What are systematic errors?

Answer 30

Errors which are the same for every measurement. Faulty equipment

Question 31

A larger resultant force leads to a ————— acceleration

Answer 31

Larger

Question 32

A larger mass leads to a ———— acceleration

Answer 32

Smaller

Question 33

As mass increases, acceleration…..

Answer 33

Decreases

Question 34

What’s the equation linking resultant force, mass and acceleration

Answer 34

Resultant force = mass X acceleration

Question 35

What is terminal velocity?

Answer 35

The maximum velocity that a freely falling object will eventually reach

Question 36

What does the mass of an object depend on?

Answer 36

The quantity of matter in it

Question 37

What is stopping distance?

Answer 37

The distance an object travels while it is attempting to stop

Question 38

Stopping distance = ———+———

Answer 38

Thinking distance + braking distance

Question 39

What can affect thinking distance?

Answer 39

Drugs Alcohol Tiredness Distractions Age

Question 40

What can affect braking distance?

Answer 40

Condition of breaks Wet/icy roads Road conditions Tyre conditions

Question 41

What is the equation for spring contant?

Answer 41

Force = spring constant X extension

Question 42

What is the equation for elastic potential energy?

Answer 42

EPE = 1/2 X spring constant (k) X extension^2

Question 43

K = 1/gradient

Answer 43

Spring contant is 1/gradient

Question 44

How do you work out gradient?

Answer 44

Rise /run

Question 45

What is momentum?

Answer 45

The tendency of the object to keep moving in the same direction

Question 46

The greater the momentum the ——— it is to stop

Answer 46

Harder

Question 47

Distance =

Answer 47

Speed X time

Question 48

What does the area under the velocity time graph tell you?

Answer 48

The distance travelled